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    <title>Document</title>
    <script>
        //for 循环可以执行相同的代码
        for (var i = 1; i <= 10;i++){
            console.log('给爷接着学！');
        }
        //我们可以让用户控制输出的次数
        var num = prompt('请您输入次数')
        for (var i = 1; i <= num; i++){
            console.log('活到老，学到老');
        }
    </script>
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